Retreiving key names from a nested JSON object based upon property values

Question

I have a nested JSON file like this...

{
    "A": {
        "Status": "Hard",
        "Level": "L1",
        "Capacity": "NR"
    },
    "B": {
        "Status": "Medium",
        "Level": "L2",
        "Capacity": "BR"
    },
    "C": {
        "Status": "Low",
        "Level": "L3",
        "Capacity": "SR"
    },
    "D": {
        "Status": "",
        "Level": "",
        "Capacity": "ZR"
    }
}

What I am looking to do is retreive the names of the key, when the Status and Level property are present or not empty. The length of the nested object can be variable.

Desired output:

A, B, C

I have looked at this solution, but I am not sure how to test for the properties ? Many thanks in advance.

score 2 · Accepted Answer · answered Jun 16 '20 at 12:07

const obj = {
    A: {
        Status: 'Hard',
        Level: 'L1',
        Capacity: 'NR',
    },
    B: {
        Status: 'Medium',
        Level: 'L2',
        Capacity: 'BR',
    },
    C: {
        Status: 'Low',
        Level: 'L3',
        Capacity: 'SR',
    },
    D: {
        Status: '',
        Level: '',
        Capacity: 'ZR',
    },
};

const result = Object.keys(obj).filter(key => obj[key].Level && obj[key].Status);

console.log(result);

score 0 · Answer 2 · answered Jun 16 '20 at 12:15

const obj = {
    A: {
        Status: 'Hard',
        Level: 'L1',
        Capacity: 'NR',
    },
    B: {
        Status: 'Medium',
        Level: 'L2',
        Capacity: 'BR',
    },
    C: {
        Status: 'Low',
        Level: 'L3',
        Capacity: 'SR',
    },
    D: {
        Status: '',
        Level: '',
        Capacity: 'ZR',
    },
};

const result = [];

for (k in obj) {
   if (obj[k].Status && obj[k].Level) {
      result.push(k)
   }
}

console.log(result);

Very similar to @NikitaMadeev response but using a `for ... in` loop — codedawi, Jun 16 '20 at 12:19

Retreiving key names from a nested JSON object based upon property values

2 Answers2